| 1. | The physical layer is concerned with the movement of _______ over the physical medium. |
| a. | programs |
| b. | dialogs |
| c. | protocols |
| d. | bits |
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Answer: (d).bits
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| 2. | The _______ is the physical path over which a message travels. |
| a. | Protocol |
| b. | Medium |
| c. | Signal |
| d. | All the above |
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Answer: (b).Medium
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| 3. | Before data can be transmitted, they must be transformed to ________. |
| a. | periodic signals |
| b. | electromagnetic signals |
| c. | aperiodic signals |
| d. | low-frequency sine waves |
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Answer: (b).electromagnetic signals
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| 4. | A periodic signal completes one cycle in 0.001 s. What is the frequency? |
| a. | 1 Hz |
| b. | 100 Hz |
| c. | 1 KHz |
| d. | 1 MHz |
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Answer: (c).1 KHz
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| 5. | The physical layer concerns with |
| a. | bit-by-bit delivery |
| b. | process to process delivery |
| c. | application to application delivery |
| d. | none of the above |
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Answer: (a).bit-by-bit delivery
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| 6. | The physical layer translates logical communication requests from the ______ into hardware specific operations. |
| a. | data link layer |
| b. | network layer |
| c. | trasnport layer |
| d. | application layer |
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Answer: (a).data link layer
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| 7. | The term ......... describes the position of the waveform relative to time 0. |
| a. | Frequency |
| b. | Phase |
| c. | Phase Shift |
| d. | Time period |
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Answer: (b).Phase
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| 8. | In a frequency-domain plot, the horizontal axis measures the ________. |
| a. | peak amplitude |
| b. | frequency |
| c. | phase |
| d. | slope |
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Answer: (b).frequency
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| 9. | In a time-domain plot, the horizontal axis is a measure of ________. |
| a. | signal amplitude |
| b. | frequency
|
| c. | phase
|
| d. | time |
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Answer: (d).time
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| 10. | If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency? |
| a. | 5 KHz
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| b. | 10 KHz |
| c. | 47 KHz
|
| d. | 57 KHz |
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Answer: (d).57 KHz
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